| Year | Count |
|---|---|
| 1970 | 6 |
| 1977 | 5 |
| 1979 | 5 |
| 1980 | 10 |
| 1982 | 7 |
| 1987 | 10 |
| 1988 | 10 |
| 1991 | 5 |
| 1992 | 18 |
| 1993 | 5 |
| 1994 | 30 |
| 1995 | 24 |
| 1996 | 44 |
| 1997 | 12 |
| 1998 | 24 |
| 1999 | 12 |
| 1999 | 6 |
| 2000 | 5 |
| 2001 | 5 |
| 2001 | 6 |
| 2002 | 10 |
| 2003 | 15 |
| 2003 | 7 |
| 2004 | 53 |
| 2004 | 7 |
| 2005 | 48 |
| 2005 | 18 |
| 2006 | 72 |
| 2006 | 14 |
| 2007 | 50 |
| 2007 | 9 |
| 2008 | 86 |
| 2008 | 12 |
| 2009 | 72 |
| 2009 | 7 |
| 2010 | 61 |
| 2011 | 118 |
| 2011 | 7 |
| 2012 | 106 |
| 2012 | 9 |
| 2013 | 64 |
| 2013 | 8 |
| 2014 | 250 |
| 2014 | 7 |
| 2015 | 329 |
| 2015 | 8 |
| 2016 | 338 |
| 2016 | 12 |
| 2017 | 319 |
| 2017 | 12 |
| 2018 | 354 |
| 2018 | 10 |
| 2019 | 348 |
| 2020 | 359 |
| 2021 | 378 |
| 2021 | 5 |
| 2022 | 397 |
| 2023 | 418 |
| 2024 | 362 |